Note 7 - Income Taxes - Components of Income Tax Expense (Benefit) from Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Federal	$ (21)	$ 4,363	$ 3,472	$ 6,205
State	24	209	546	340
Total current income tax expense	3	4,572	4,018	6,545
Federal	679	(1,798)	1,516	(1,146)
State	182	(427)	791	(803)
Total deferred income tax expense (benefit)	861	(2,225)	2,307	(1,949)
Change in valuation allowance	0	1	0	2
Total income tax expense	$ 864	$ 2,348	$ 6,325	$ 4,598